Attention: Mozilla Firefox players.

Starting the 7th of March of 2017, Mozilla will drop support for all NPAPI plug-ins in Firefox 52, making Kings of the Realm Unplayable in this browser.

This will only occur if you upgrade to Firefox 52.

We are aware that some of our players will be affected by this and we are currently working on finding a solution.
At present Safari still runs Kings of the Realm (Safari for Windows users may encounter some display issues at higher resolutions, these are fixed by full screening the game).
And as always, the game is available on iOS, Android and Windows 8/10 store.

We apologize for any inconvenience this may cause and will keep you updated on any progress we make addressing the issue.

I can confirm that NPAPI plug-ins (at lesat unity, that is required by KotR) still works on Firfox 52+.
All you need to do is add variable in FF configuration page about:configplugin.load_flash_only of type boolean with a value false